diff --git a/Cargo.lock b/Cargo.lock index a6600c07..17d77d11 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -4,9 +4,9 @@ version = 3 [[package]] name = "addr2line" -version = "0.21.0" +version = "0.22.0" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb" +checksum = "6e4503c46a5c0c7844e948c9a4d6acd9f50cccb4de1c48eb9e291ea17470c678" dependencies = [ "gimli", ] @@ -52,57 +52,58 @@ dependencies = [ [[package]] name = "anstream" -version = "0.6.4" +version = "0.6.14" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "2ab91ebe16eb252986481c5b62f6098f3b698a45e34b5b98200cf20dd2484a44" +checksum = "418c75fa768af9c03be99d17643f93f79bbba589895012a80e3452a19ddda15b" dependencies = [ "anstyle", "anstyle-parse", "anstyle-query", "anstyle-wincon", "colorchoice", + "is_terminal_polyfill", "utf8parse", ] [[package]] name = "anstyle" -version = "1.0.4" +version = "1.0.7" source = 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-checksum = "89d92a4743f9a61002fae18374ed11e7973f530cb3a3255fb354818118b2203c" +checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c" [[package]] name = "lock_api" -version = "0.4.11" +version = "0.4.12" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "3c168f8615b12bc01f9c17e2eb0cc07dcae1940121185446edc3744920e8ef45" +checksum = "07af8b9cdd281b7915f413fa73f29ebd5d55d0d3f0155584dade1ff18cea1b17" dependencies = [ "autocfg", "scopeguard", @@ -378,9 +462,9 @@ dependencies = [ [[package]] name = "log" -version = "0.4.20" +version = "0.4.21" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f" +checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c" [[package]] name = "lru" @@ -393,35 +477,35 @@ dependencies = [ [[package]] name = "memchr" -version = "2.6.4" +version = "2.7.2" source = 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[[package]] name = "zerocopy" -version = "0.7.32" +version = "0.7.34" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "74d4d3961e53fa4c9a25a8637fc2bfaf2595b3d3ae34875568a5cf64787716be" +checksum = "ae87e3fcd617500e5d106f0380cf7b77f3c6092aae37191433159dda23cfb087" dependencies = [ "zerocopy-derive", ] [[package]] name = "zerocopy-derive" -version = "0.7.32" +version = "0.7.34" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6" +checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b" dependencies = [ "proc-macro2", "quote", diff --git a/Cargo.toml b/Cargo.toml index ded60c37..05e94d48 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -16,6 +16,11 @@ tokio-stream = "0.1" thiserror = "1.0.20" futures-util = "0.3.28" async-trait = "0.1.77" +sha2 = "0.10.2" +hmac = "0.12.1" +rust-crypto = "0.2" +base64 = "0.22.1" + lru = "0.12.3" [lib] diff --git a/src/dnssec.rs b/src/dnssec.rs new file mode 100644 index 00000000..9f6c7239 --- /dev/null +++ b/src/dnssec.rs @@ -0,0 +1,4 @@ +pub mod dnssec_message; +pub mod dnssec_message_processing; +pub mod dnssec_fetch; +pub mod rrset_signature; \ No newline at end of file diff --git a/src/dnssec/dnssec_fetch.rs b/src/dnssec/dnssec_fetch.rs new file mode 100644 index 00000000..ccd090aa --- /dev/null +++ b/src/dnssec/dnssec_fetch.rs @@ -0,0 +1,20 @@ +use crate::message::DnsMessage; +use crate::message::rdata::Rdata; +use crate::message::rdata::dnskey_rdata::DnskeyRdata; +use crate::message::resource_record::ResourceRecord; +use crate::dnssec::dnssec_message_processing::extract_dnssec_records; +use crate::dnssec::rrset_signature::{verify_rrsig, verify_ds}; + +use crate::client::client_error::ClientError; + +pub async fn fetch_dnskey_records(dns_response: &DnsMessage) -> Result, ClientError> { + let mut dnskey_records = Vec::new(); + + for record in dns_response.get_answer() { + if let Rdata::DNSKEY(dnskey) = &record.get_rdata() { + dnskey_records.push(dnskey.clone()); + } + } + + Ok(dnskey_records) +} diff --git a/src/dnssec/dnssec_message.rs b/src/dnssec/dnssec_message.rs new file mode 100644 index 00000000..3f1b4b0c --- /dev/null +++ b/src/dnssec/dnssec_message.rs @@ -0,0 +1,86 @@ +use std::str::FromStr; +use crate::domain_name::DomainName; +use crate::message::rclass::Rclass; +use crate::message::DnsMessage; +use crate::message::rdata::opt_rdata::OptRdata; +use crate::message::rdata::Rdata; +use crate::message::resource_record::{FromBytes, ResourceRecord, ToBytes}; +use crate::message::rcode; +use crate::message::rcode::Rcode; +use crate::message::rrtype::Rrtype; + +const EDNS_VERSION: u8 = 0; +const REQUESTED_UDP_LEN: u16 = 4096; +/* +The mechanism chosen for the explicit notification of the ability of +the client to accept (if not understand) DNSSEC security RRs is using +the most significant bit of the Z field on the EDNS0 OPT header in +the query. This bit is referred to as the "DNSSEC OK" (DO) bit. In +the context of the EDNS0 OPT meta-RR, the DO bit is the first bit of +the third and fourth bytes of the "extended RCODE and flags" portion +of the EDNS0 OPT meta-RR, structured as follows: + + +0 (MSB) +1 (LSB) + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + 0: | EXTENDED-RCODE | VERSION | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ + 2: |DO| Z | + +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +*/ +fn create_opt_rr(capacity: u16 ,e_rcode :u8, version: u8, do_bit: bool) -> ResourceRecord { + let opt_rdata = OptRdata::new(); + let rdata = Rdata::OPT(opt_rdata); + let mut rr = ResourceRecord::new(rdata); + + let do_val: u16 = if do_bit {0x8000} else {0x0}; + let ttl: u32 = (e_rcode as u32) << 24 | (version as u32) << 16| (do_val as u32); + rr.set_ttl(ttl); + rr.set_rclass(Rclass::UNKNOWN(capacity)); + println!("EL ttl es: {:#05x?}", ttl); + rr +} + +fn read_opt_rr(opt_rr: ResourceRecord) -> String { + let requested_udp_len = Rclass::from(opt_rr.get_rclass()); + let data = opt_rr.get_ttl().to_be_bytes(); + let (e_rcode, version) = (data[0], data[1]); + let z = u16::from_be_bytes([data[2], data[3]]); + + let do_bit = ((z & 0x8000) > 0) as u8 ; + format!("OPT PSEUDO-RR\n\trequested_udp_len: {requested_udp_len}\n\terror code: {e_rcode}\n\tversion: EDNS{version}\n\tuse dnssec: {do_bit}") +} + +/* + A security-aware resolver MUST include an EDNS ([RFC2671]) OPT + pseudo-RR with the DO ([RFC3225]) bit set when sending queries. +*/ +fn create_dns_message_with_dnssec(mut msg: DnsMessage) -> DnsMessage { + // We create a opt rr with the do bit set to 1 + // with NOERR as rcode and EDNS0 + let rr = create_opt_rr(REQUESTED_UDP_LEN, + Rcode::from(Rcode::NOERROR).into(), + EDNS_VERSION, + true); + + let vec = vec![rr]; + msg.add_additionals(vec); + msg +} + +#[test] +fn see_dnssec_message() { + let query = DnsMessage::new_query_message( + DomainName::new_from_str("example.com"), + Rrtype::A, + Rclass::UNKNOWN(4096), + 1, + true, + 2000 + ); + let query= create_dns_message_with_dnssec(query); + assert_eq!(String::from_str + ("OPT PSEUDO-RR\n\trequested_udp_len: 4096\n\terror code: 0\n\tversion: EDNS0\n\tuse dnssec: 1") + .expect("Not a utf8 str"), + read_opt_rr(query.get_additional().pop().expect("No OPT Record!")) + ) +} \ No newline at end of file diff --git a/src/dnssec/dnssec_message_processing.rs b/src/dnssec/dnssec_message_processing.rs new file mode 100644 index 00000000..8bbfff40 --- /dev/null +++ b/src/dnssec/dnssec_message_processing.rs @@ -0,0 +1,21 @@ +use crate::message::DnsMessage; +use crate::message::rdata::Rdata; +use crate::message::resource_record::ResourceRecord; + +pub fn extract_dnssec_records(dns_response: &DnsMessage) -> (Vec, Vec) { + let answers = dns_response.get_answer(); + let additionals = dns_response.get_additional(); + + let mut dnskey_records = Vec::new(); + let mut rrsig_records = Vec::new(); + + for record in answers.iter().chain(additionals.iter()) { + match record.get_rdata() { + Rdata::DNSKEY(_) => dnskey_records.push(record.clone()), + Rdata::RRSIG(_) => rrsig_records.push(record.clone()), + _ => {} + } + } + + (dnskey_records, rrsig_records) +} diff --git a/src/dnssec/rrset_signature.rs b/src/dnssec/rrset_signature.rs new file mode 100644 index 00000000..d7d75447 --- /dev/null +++ b/src/dnssec/rrset_signature.rs @@ -0,0 +1,72 @@ +use sha2::{Sha256, Digest}; +use crypto::digest::Digest as RustDigest; +use crypto::sha1::Sha1; +use base64::encode; +use crate::message::rdata::Rdata; +use crate::message::rdata::dnskey_rdata::DnskeyRdata; +use crate::message::rdata::rrsig_rdata::RRSIGRdata; +use crate::message::rrtype::Rrtype; +use crate::message::resource_record::{ResourceRecord, ToBytes}; +use crate::client::client_error::ClientError; + +pub fn verify_rrsig(rrsig: &RRSIGRdata, dnskey: &DnskeyRdata, rrset: &[ResourceRecord]) -> Result { + let mut rrsig_data = Vec::new(); + rrsig_data.extend_from_slice(&u16::from(rrsig.get_type_covered()).to_be_bytes()); + rrsig_data.push(rrsig.get_algorithm()); + rrsig_data.push(rrsig.get_labels()); + rrsig_data.extend_from_slice(&rrsig.get_original_ttl().to_be_bytes()); + rrsig_data.extend_from_slice(&rrsig.get_signature_expiration().to_be_bytes()); + rrsig_data.extend_from_slice(&rrsig.get_signature_inception().to_be_bytes()); + rrsig_data.extend_from_slice(&rrsig.get_key_tag().to_be_bytes()); + rrsig_data.extend_from_slice(&rrsig.get_signer_name().to_bytes());//Try? + + let mut rrset_sorted = rrset.to_vec(); + rrset_sorted.sort_by(|a, b| a.get_name().cmp(&b.get_name())); + + for rr in rrset_sorted.iter() { + rrsig_data.extend_from_slice(&rr.get_name().to_bytes()); //Try? + rrsig_data.extend_from_slice(&rr.get_ttl().to_be_bytes()); + rrsig_data.extend_from_slice(&(rr.get_rdata().to_bytes().len() as u16).to_be_bytes()); + rrsig_data.extend_from_slice(&rr.get_rdata().to_bytes());//Try? + } + + let signature = rrsig.get_signature().clone(); + let hashed = Sha256::digest(&rrsig_data); + + match dnskey.algorithm { + 3 | 5 => { + // (DSA/RSA)/SHA1 + let mut sha1 = Sha1::new(); + sha1.input(&rrsig_data); + let digest = sha1.result_str(); + Ok(digest == encode(&signature)) + }, + 8 => { + // RSA/SHA256 + Ok(encode(&hashed) == encode(&signature)) + }, + _ => Err(ClientError::NotImplemented("Unknown DNSKEY algorithm")), + } +} + +pub fn verify_ds(ds_record: &ResourceRecord, dnskey: &DnskeyRdata) -> Result { + if let Rdata::DS(ds_rdata) = &ds_record.get_rdata() { + let dnskey_bytes = dnskey.to_bytes(); //Try? + let hashed_key = match ds_rdata.algorithm { + 1 => { + let mut hasher = Sha1::new(); + hasher.input(&dnskey_bytes); + hasher.result_str() + }, + 2 => { + let hashed = Sha256::digest(&dnskey_bytes); + encode(&hashed) + }, + _ => return Err(ClientError::NotImplemented("Unknown DS algorithm")), + }; + + Ok(ds_rdata.digest == hashed_key.as_bytes()) + } else { + Err(ClientError::FormatError("Provided record is not a DS record")) + } +} diff --git a/src/lib.rs b/src/lib.rs index 0a2f1a87..cff3be71 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -5,7 +5,5 @@ pub mod domain_name; pub mod message; pub mod async_resolver; pub mod truncated_dns_message; - - - - +pub mod tsig; +pub mod dnssec; \ No newline at end of file diff --git a/src/message.rs b/src/message.rs index c7d3cbc7..f820f175 100644 --- a/src/message.rs +++ b/src/message.rs @@ -615,6 +615,7 @@ impl DnsMessage { let mut msg_answers = self.get_answer(); msg_answers.append(&mut answers); + self.header.set_ancount(msg_answers.len() as u16); self.set_answer(msg_answers); } @@ -640,6 +641,7 @@ impl DnsMessage { let mut msg_authorities = self.get_authority(); msg_authorities.append(&mut authorities); + self.header.set_nscount(msg_authorities.len() as u16); self.set_answer(msg_authorities); } @@ -656,6 +658,7 @@ impl DnsMessage { let mut msg_additionals = self.get_additional(); msg_additionals.append(&mut additionals); + self.header.set_arcount(msg_additionals.len() as u16); self.set_additional(msg_additionals); } @@ -683,14 +686,17 @@ impl DnsMessage { impl fmt::Display for DnsMessage { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { let mut result = String::new(); + let question = self.get_question(); let answers = self.get_answer().into_iter(); let authority = self.get_authority().into_iter(); let additional = self.get_additional().into_iter(); - result.push_str(&format!("Answer\n")); + result.push_str(&format!("Question section\n")); + result.push_str(&format!("{}\n", question)); + result.push_str(&format!("Answer section\n")); answers.for_each(|answer| result.push_str(&format!("{}\n", answer))); - result.push_str(&format!("Authority\n")); + result.push_str(&format!("Authority section\n")); authority.for_each(|authority| result.push_str(&format!("{}\n", authority))); - result.push_str(&format!("Additional\n")); + result.push_str(&format!("Additional section\n")); additional.for_each(|additional| result.push_str(&format!("{}\n", additional))); write!(f, "{}", result) } @@ -984,7 +990,7 @@ mod message_test { */ let bytes: [u8; 50] = [ //test passes with this one - 0b00100100, 0b10010101, 0b10010010, 0b00000000, 0, 1, 0b00000000, 1, 0, 0, 0, 0, 4, 116, + 0b00100100, 0b10010101, 0b10010010, 0b00100000, 0, 1, 0b00000000, 1, 0, 0, 0, 0, 4, 116, 101, 115, 116, 3, 99, 111, 109, 0, 0, 16, 0, 1, 3, 100, 99, 99, 2, 99, 108, 0, 0, 16, 0, 1, 0, 0, 0b00010110, 0b00001010, 0, 6, 5, 104, 101, 108, 108, 111, ]; @@ -1002,7 +1008,10 @@ mod message_test { assert_eq!(header.get_qr(), true); assert_eq!(header.get_op_code(), 2); assert_eq!(header.get_tc(), true); + + assert_eq!(header.get_ad(), true); assert_eq!(header.get_rcode(), Rcode::NOERROR); + assert_eq!(header.get_ancount(), 1); // Question @@ -1041,7 +1050,10 @@ mod message_test { header.set_qr(true); header.set_op_code(2); header.set_tc(true); + + header.set_ad(true); header.set_rcode(Rcode::UNKNOWN(8)); + header.set_ancount(0b0000000000000001); header.set_qdcount(1); @@ -1081,7 +1093,7 @@ mod message_test { let msg_bytes = &dns_msg.to_bytes(); let real_bytes: [u8; 50] = [ - 0b00100100, 0b10010101, 0b10010010, 0b00001000, 0, 1, 0b00000000, 0b00000001, 0, 0, 0, + 0b00100100, 0b10010101, 0b10010010, 0b00101000, 0, 1, 0b00000000, 0b00000001, 0, 0, 0, 0, 4, 116, 101, 115, 116, 3, 99, 111, 109, 0, 0, 5, 0, 2, 3, 100, 99, 99, 2, 99, 108, 0, 0, 16, 0, 1, 0, 0, 0b00010110, 0b00001010, 0, 6, 5, 104, 101, 108, 108, 111, ]; diff --git a/src/message/header.rs b/src/message/header.rs index 4e2b60dc..0d9b6c9b 100644 --- a/src/message/header.rs +++ b/src/message/header.rs @@ -3,22 +3,23 @@ use crate::message::rcode::Rcode; #[derive(Default, Clone)] /// An struct that represents a Header secction from a DNS message. -/// -/// 1 1 1 1 1 1 -/// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ -/// | ID | -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ -/// |QR| Opcode |AA|TC|RD|RA| Z | RCODE | -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ -/// | QDCOUNT | -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ -/// | ANCOUNT | -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ -/// | NSCOUNT | -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ -/// | ARCOUNT | -/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// EDIT: now added bits AD CD for DNS security extensions. +/// +/// 1 1 1 1 1 1 +/// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// | ID | +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// |QR| Opcode |AA|TC|RD|RA| Z|AD|CD| RCODE | +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// | QDCOUNT | +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// | ANCOUNT | +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// | NSCOUNT | +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +/// | ARCOUNT | +/// +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ #[derive (PartialEq, Debug)] pub struct Header { /// Id @@ -40,10 +41,12 @@ pub struct Header { tc: bool, // TrunCation rd: bool, // Recursion Desired ra: bool, // Recursion Available + ad: bool, // Authentic Data + cd: bool, // Checking Disabled - /// Reserved + /// Reserved Edit: Now z is just a flag #[allow(dead_code)] - z: u8, + z: bool, /// Response Code /// @@ -137,7 +140,11 @@ impl Header { let tc = (bytes[2] & 0b00000010) >> 1; let rd = bytes[2] & 0b00000001; let ra = bytes[3] >> 7; + + let ad = (bytes[3] & 0b00100000) >> 5; + let cd = (bytes[3] & 0b00010000) >> 4; let rcode = Rcode::from(bytes[3] & 0b00001111); + let qdcount = ((bytes[4] as u16) << 8) | bytes[5] as u16; let ancount = ((bytes[6] as u16) << 8) | bytes[7] as u16; let nscount = ((bytes[8] as u16) << 8) | bytes[9] as u16; @@ -151,6 +158,8 @@ impl Header { header.set_tc(tc != 0); header.set_rd(rd != 0); header.set_ra(ra != 0); + header.set_ad(ad != 0); + header.set_cd(cd != 0); header.set_rcode(rcode); header.set_qdcount(qdcount); header.set_ancount(ancount); @@ -209,7 +218,7 @@ impl Header { return 0b00000100; } - return 0 as u8; + return 0u8; } /// Returns a byte that represents the field in the DNS message. @@ -222,7 +231,7 @@ impl Header { return 0b00000010; } - return 0 as u8; + return 0u8; } /// Returns a byte that represents the field in the DNS message. @@ -235,7 +244,7 @@ impl Header { return 0b00000001; } - return 0 as u8; + return 0u8; } /// Returns a byte that represents the field in the DNS message. @@ -248,7 +257,33 @@ impl Header { return 0b10000000; } - return 0 as u8; + return 0u8; + } + + /// Returns a byte that represents the field in the DNS message. + /// + /// See the DNS message structure in struct documentation for more info. + fn ad_to_byte(&self) -> u8 { + let ad = self.get_ad(); + + if ad { + return 0b00100000; + } + + return 0u8; + } + + /// Returns a byte that represents the field in the DNS message. + /// + /// See the DNS message structure in struct documentation for more info. + fn cd_to_byte(&self) -> u8 { + let cd = self.get_cd(); + + if cd { + return 0b00010000; + } + + return 0u8; } /// Gets the first byte from the qdcount attribute. @@ -331,9 +366,13 @@ impl Header { /// Gets a byte that represents the second byte of flags section. fn get_second_flags_byte(&self) -> u8 { let ra_byte = self.ra_to_byte(); + + let ad_byte = self.ad_to_byte(); + let cd_byte = self.cd_to_byte(); let rcode_byte = u8::from(self.get_rcode()); - let second_byte = ra_byte | rcode_byte; + + let second_byte = ra_byte | ad_byte | cd_byte | rcode_byte; second_byte } @@ -382,7 +421,7 @@ impl Header { header_bytes } - /// Checks if the header is well formed. + /// Checks if the header is well-formed. pub fn format_check(&self)-> Result{ // OP CODE: A four bit field between 0-15 @@ -390,8 +429,8 @@ impl Header { return Err("Format Error: OP CODE"); } - // Z: A 3 bit field that MUST be zero - if self.z != 0 { + // Z: A z flag field MUST be zero/false + if self.z != false { return Err("Format Error: Z"); } @@ -441,6 +480,16 @@ impl Header { self.ra = ra; } + /// Sets the ad attribute with a value. + pub fn set_ad(&mut self, ad: bool) { + self.ad = ad; + } + + /// Sets the cd attribute with a value. + pub fn set_cd(&mut self, cd: bool) { + self.cd = cd; + } + /// Sets the rcode attribute with a value. pub fn set_rcode(&mut self, rcode: Rcode) { self.rcode = rcode; @@ -504,6 +553,16 @@ impl Header { self.ra } + /// Gets the ad attribute value. + pub fn get_ad(&self) -> bool { + self.ad + } + + /// Gets the cd attribute value. + pub fn get_cd(&self) -> bool { + self.cd + } + /// Gets the `rcode` attribute value. pub fn get_rcode(&self) -> Rcode { self.rcode @@ -546,7 +605,11 @@ mod header_test { assert_eq!(header.tc, false); assert_eq!(header.rd, false); assert_eq!(header.ra, false); + + assert_eq!(header.ad, false); + assert_eq!(header.cd, false); assert_eq!(header.rcode, Rcode::NOERROR); + assert_eq!(header.qdcount, 0); assert_eq!(header.ancount, 0); assert_eq!(header.nscount, 0); @@ -637,6 +700,30 @@ mod header_test { assert_eq!(ra, true); } + #[test] + fn set_and_get_ad() { + let mut header = Header::new(); + + let mut ad = header.get_ad(); + assert_eq!(ad, false); + + header.set_ad(true); + ad = header.get_ad(); + assert_eq!(ad, true); + } + + #[test] + fn set_and_get_cd() { + let mut header = Header::new(); + + let mut cd = header.get_cd(); + assert_eq!(cd, false); + + header.set_cd(true); + cd = header.get_cd(); + assert_eq!(cd, true); + } + #[test] fn set_and_get_rcode() { let mut header = Header::new(); @@ -708,13 +795,17 @@ mod header_test { header.set_qr(true); header.set_op_code(2); header.set_tc(true); + + header.set_ad(true); + header.set_cd(true); header.set_rcode(Rcode::REFUSED); + header.set_ancount(0b0000101010100101); bytes[0] = 0b00100100; bytes[1] = 0b10010101; bytes[2] = 0b10010010; - bytes[3] = 0b00000101; + bytes[3] = 0b00110101; bytes[6] = 0b00001010; bytes[7] = 0b10100101; @@ -728,7 +819,7 @@ mod header_test { bytes[0] = 0b00100100; bytes[1] = 0b10010101; bytes[2] = 0b10010010; - bytes[3] = 0b00000101; + bytes[3] = 0b00110101; bytes[6] = 0b00001010; bytes[7] = 0b10100101; @@ -738,7 +829,11 @@ mod header_test { header.set_qr(true); header.set_op_code(2); header.set_tc(true); + + header.set_ad(true); + header.set_cd(true); header.set_rcode(Rcode::REFUSED); + header.set_ancount(0b0000101010100101); let header_from_bytes = Header::from_bytes(&bytes); @@ -790,8 +885,10 @@ mod header_test { ]; let mut header = Header::from_bytes(&bytes_header); - header.z = 3; + + header.z = true; header.set_rcode(Rcode::UNKNOWN(16)); + header.set_op_code(22); let result_check = header.format_check(); diff --git a/src/message/question.rs b/src/message/question.rs index af445d7a..bc9f4cd5 100644 --- a/src/message/question.rs +++ b/src/message/question.rs @@ -4,6 +4,8 @@ use crate::message::rclass::Rclass; use super::rrtype::Rrtype; +use std::fmt; + #[derive(Default, Clone)] /// An struct that represents the question section from a dns message /// ```text @@ -29,6 +31,20 @@ pub struct Question { rclass: Rclass, } + +impl fmt::Display for Question { + fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + let name = self.get_qname().get_name(); + let rtype = self.get_rrtype(); + let rclass = self.get_rclass(); + + formatter.write_fmt(format_args!( + "{} {} {} ", + name, rclass, rtype + )) + } +} + // Methods impl Question { /// Creates a new Question with default values diff --git a/src/message/rdata.rs b/src/message/rdata.rs index c186c080..f057bd18 100644 --- a/src/message/rdata.rs +++ b/src/message/rdata.rs @@ -589,11 +589,33 @@ mod resolver_query_tests { #[test] fn to_bytes_tsigrdata(){ let expected_bytes = vec![ - 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, - 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, - 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, 0x0, 0x0, 0x0, - 0x0, 0x7, 0x5B, 0xCD, 0x15, 0x4, 0xD2, 0x0, 0x4, 0xA1, 0xB2, 0xC3, 0xD4, - 0x4, 0xD2, 0x0, 0x0, 0x0, 0x0 + //This is the string "hmac-md5.sig-alg.reg.int" in octal, terminated in 00 + 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, + 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, + 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, + + //this is the time signed 123456789 == 0x75bcd15 + 0x0, 0x0, 0x7, 0x5B, 0xCD, 0x15, + + // this the fudge 1234 + 0x4, 0xD2, + + // this is the macsize = 4 + 0x0, 0x4, + + // this is the mac = [0xA1, 0xB2, 0xC3, 0xD4] + 0xA1, 0xB2, 0xC3, 0xD4, + + // this is the original id = 1234 + 0x4, 0xD2, + + // this is the error = 0 + 0x0, 0x0, + + // this is the other len = 0 + 0x0, 0x0 + + // No other data, so its empty! ]; let mut tsig_rdata = TSigRdata::new(); @@ -932,11 +954,34 @@ mod resolver_query_tests { #[test] fn from_bytes_tsig_rdata(){ let data_bytes = vec![ - 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, - 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, - 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, 0x0, 0x0, 0x0, - 0x0, 0x7, 0x5B, 0xCD, 0x15, 0x4, 0xD2, 0x0, 0x4, 0xA1, 0xB2, 0xC3, 0xD4, - 0x4, 0xD2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xFA, 0x0, 0x1 + //This is the string "hmac-md5.sig-alg.reg.int" in octal, terminated in 00 + 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, + 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, + 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, + + //this is the time signed 123456789 == 0x75bcd15 + 0x0, 0x0, 0x7, 0x5B, 0xCD, 0x15, + + // this the fudge 1234 + 0x4, 0xD2, + + // this is the macsize = 4 + 0x0, 0x4, + + // this is the mac = [0xA1, 0xB2, 0xC3, 0xD4] + 0xA1, 0xB2, 0xC3, 0xD4, + + // this is the original id = 1234 + 0x4, 0xD2, + + // this is the error = 0 + 0x0, 0x0, + + // this is the other len = 0 + 0x0, 0x0, + //Extra bytes for from_bytes function + 0x0, 0xFA, 0x0, 0x1 + // No other data, so its empty! ]; let rdata = Rdata::from_bytes(&data_bytes, &data_bytes).unwrap(); let mut domain_name = DomainName::new(); diff --git a/src/message/rdata/opt_rdata.rs b/src/message/rdata/opt_rdata.rs index ce394dec..1c2b0fae 100644 --- a/src/message/rdata/opt_rdata.rs +++ b/src/message/rdata/opt_rdata.rs @@ -53,6 +53,7 @@ impl FromBytes> for OptRdata { return Err("Format Error"); } + let option_code = OptionCode::from(u16::from_be_bytes([bytes[i], bytes[i + 1]])); let option_length = u16::from_be_bytes([bytes[i + 2], bytes[i + 3]]); diff --git a/src/message/rdata/tsig_rdata.rs b/src/message/rdata/tsig_rdata.rs index 179d759d..6519cc05 100644 --- a/src/message/rdata/tsig_rdata.rs +++ b/src/message/rdata/tsig_rdata.rs @@ -67,10 +67,6 @@ impl ToBytes for TSigRdata{ let time_signed = self.get_time_signed(); - bytes.push((time_signed >> 56) as u8); - - bytes.push((time_signed >> 48) as u8); - bytes.push((time_signed >> 40) as u8); bytes.push((time_signed >> 32) as u8); @@ -78,6 +74,10 @@ impl ToBytes for TSigRdata{ bytes.push((time_signed >> 24) as u8); bytes.push((time_signed >> 16) as u8); + + bytes.push((time_signed >> 8) as u8); + + bytes.push((time_signed >> 0) as u8); let fudge = self.get_fudge(); @@ -255,14 +255,14 @@ impl TSigRdata { /// Set the time signed attribute from an array of bytes. fn set_time_signed_from_bytes(&mut self, bytes: &[u8]){ - let time_signed = (bytes[0] as u64) << 56 - | (bytes[1] as u64) << 48 - | (bytes[2] as u64) << 40 - | (bytes[3] as u64) << 32 - | (bytes[4] as u64) << 24 - | (bytes[5] as u64) << 16 - | (0 as u64) << 8 - | 0 as u64; + + let time_signed = (bytes[0] as u64) << 40 + | (bytes[1] as u64) << 32 + | (bytes[2] as u64) << 24 + | (bytes[3] as u64) << 16 + | (bytes[4] as u64) << 8 + | (bytes[5] as u64) << 0; + self.set_time_signed(time_signed); } @@ -561,7 +561,6 @@ mod tsig_rdata_test { } #[test] - #[ignore = "Fix test"] fn to_bytes_test(){ let mut tsig_rdata = TSigRdata::new(); @@ -580,11 +579,33 @@ mod tsig_rdata_test { let bytes_to_test = tsig_rdata.to_bytes(); let bytes = vec![ - 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, - 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, - 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, 0x0, 0x0, 0x0, - 0x0, 0x7, 0x5B, 0xCD, 0x15, 0x4, 0xD2, 0x0, 0x4, 0xA1, 0xB2, 0xC3, 0xD4, - 0x4, 0xD2, 0x0, 0x0, 0x0, 0x0 + //This is the string "hmac-md5.sig-alg.reg.int" in octal, terminated in 00 + 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, + 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, + 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, + + //this is the time signed 123456789 == 0x75bcd15 + 0x0, 0x0, 0x7, 0x5B, 0xCD, 0x15, + + // this the fudge 1234 + 0x4, 0xD2, + + // this is the macsize = 4 + 0x0, 0x4, + + // this is the mac = [0xA1, 0xB2, 0xC3, 0xD4] + 0xA1, 0xB2, 0xC3, 0xD4, + + // this is the original id = 1234 + 0x4, 0xD2, + + // this is the error = 0 + 0x0, 0x0, + + // this is the other len = 0 + 0x0, 0x0 + + // No other data, so its empty! ]; for i in 0..bytes.len() { @@ -593,14 +614,35 @@ mod tsig_rdata_test { } #[test] - #[ignore = "Fix test"] fn from_bytes_test(){ let bytes = vec![ - 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, - 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, - 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, 0x0, 0x0, 0x0, - 0x0, 0x7, 0x5B, 0xCD, 0x15, 0x4, 0xD2, 0x0, 0x4, 0xA1, 0xB2, 0xC3, 0xD4, - 0x4, 0xD2, 0x0, 0x0, 0x0, 0x0 + //This is the string "hmac-md5.sig-alg.reg.int" in octal, terminated in 00 + 0x8, 0x68, 0x6D, 0x61, 0x63, 0x2D, 0x6D, 0x64, + 0x35, 0x7, 0x73, 0x69, 0x67, 0x2D, 0x61, 0x6C, 0x67, + 0x3, 0x72, 0x65, 0x67, 0x3, 0x69, 0x6E, 0x74, 0x0, + + //this is the time signed 123456789 == 0x75bcd15 + 0x0, 0x0, 0x7, 0x5B, 0xCD, 0x15, + + // this the fudge 1234 + 0x4, 0xD2, + + // this is the macsize = 4 + 0x0, 0x4, + + // this is the mac = [0xA1, 0xB2, 0xC3, 0xD4] + 0xA1, 0xB2, 0xC3, 0xD4, + + // this is the original id = 1234 + 0x4, 0xD2, + + // this is the error = 0 + 0x0, 0x0, + + // this is the other len = 0 + 0x0, 0x0 + + // No other data, so its empty! ]; let tsig_rdata_result = TSigRdata::from_bytes(&bytes, &bytes); diff --git a/src/message/resource_record.rs b/src/message/resource_record.rs index 78017e58..64ab9a0b 100644 --- a/src/message/resource_record.rs +++ b/src/message/resource_record.rs @@ -212,7 +212,7 @@ impl ResourceRecord { Rdata::TSIG(val) => ResourceRecord { name: DomainName::new(), rtype: Rrtype::TSIG, - rclass: Rclass::IN, + rclass: Rclass::ANY, ttl: 0 as u32, rdlength: 0 as u16, rdata: Rdata::TSIG(val), diff --git a/src/message/rrset.rs b/src/message/rrset.rs new file mode 100644 index 00000000..00e5d0a9 --- /dev/null +++ b/src/message/rrset.rs @@ -0,0 +1,185 @@ +use crate::message::Rtype; +use crate::message::Rclass; +use crate::message::resource_record::ResourceRecord; +use std::collections::HashSet; + +/// Represents a set of resource records (RRset). +#[derive(Debug)] +pub struct RRset { + /// The name of the domain associated with this RRset. + name: String, + /// The type of resource record in this RRset. + rtype: Rtype, + /// The class of resource record in this RRset. + rclass: Rclass, + /// The time to live (TTL) value for records in this RRset. + ttl: u32, + /// The set of resource records belonging to this RRset. + records: HashSet, +} + +impl RRset { + /// Creates a new RRset. + pub fn new(name: String, rtype: Rtype, rclass: Rclass, ttl: u32) -> RRset { + RRset { + name, + rtype, + rclass, + ttl, + records: HashSet::new(), + } + } + + /// Adds a resource record to this RRset. + pub fn add_record(&mut self, record: ResourceRecord) { + self.records.insert(record); + } + + /// Gets the name of the domain associated with this RRset. + pub fn get_name(&self) -> &String { + &self.name + } + + /// Gets the type of resource record in this RRset. + pub fn get_type(&self) -> Rtype { + self.rtype + } + + /// Gets the class of resource record in this RRset. + pub fn get_class(&self) -> Rclass { + self.rclass + } + + /// Gets the time to live (TTL) value for records in this RRset. + pub fn get_ttl(&self) -> u32 { + self.ttl + } + + /// Gets the set of resource records belonging to this RRset. + pub fn get_records(&self) -> &HashSet { + &self.records + } + + /// Gets the labels of the domain associated with this RRset. + pub fn get_labels(&self) -> usize { + self.name.split('.').count() + } + + /// Serializes the RRset to a byte array for signing. + pub fn to_bytes(&self) -> Vec { + let mut bytes = Vec::new(); + for record in &self.records { + bytes.extend(record.to_bytes()); // Assuming ResourceRecord has a to_bytes method + } + bytes + } +} + + +#[cfg(test)] +mod tests { + use super::*; + use crate::message::Rtype; + use crate::message::Rclass; + use crate::message::resource_record::{ResourceRecord, Rdata, ARdata, NsRdata, CnameRdata}; + use std::net::IpAddr; + use std::collections::HashSet; + + #[test] + fn test_create_rrset() { + let name = "example.com".to_string(); + let rtype = Rtype::A; + let rclass = Rclass::IN; + let ttl = 3600; + + let rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + assert_eq!(rrset.get_name(), &name); + assert_eq!(rrset.get_type(), Rtype::A); + assert_eq!(rrset.get_class(), Rclass::IN); + assert_eq!(rrset.get_ttl(), 3600); + assert_eq!(rrset.get_labels(), 2); + assert!(rrset.get_records().is_empty()); + } + + #[test] + fn test_add_record() { + let name = "example.com".to_string(); + let rtype = Rtype::A; + let rclass = Rclass::IN; + let ttl = 3600; + + let mut rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + let mut a_rdata = Rdata::A(ARdata::new()); + match a_rdata { + Rdata::A(ref mut val) => val.set_address(IpAddr::from([127, 0, 0, 1])), + _ => unreachable!(), + } + + let record = ResourceRecord::new(a_rdata); + rrset.add_record(record); + + assert_eq!(rrset.get_records().len(), 1); + } + + #[test] + fn test_get_name() { + let name = "example.com".to_string(); + let rtype = Rtype::A; + let rclass = Rclass::IN; + let ttl = 3600; + + let rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + assert_eq!(rrset.get_name(), &name); + } + + #[test] + fn test_get_type() { + let name = "example.com".to_string(); + let rtype = Rtype::NS; + let rclass = Rclass::IN; + let ttl = 3600; + + let rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + assert_eq!(rrset.get_type(), Rtype::NS); + } + + #[test] + fn test_get_class() { + let name = "example.com".to_string(); + let rtype = Rtype::MX; + let rclass = Rclass::CH; + let ttl = 3600; + + let rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + assert_eq!(rrset.get_class(), Rclass::CH); + } + + #[test] + fn test_get_ttl() { + let name = "example.com".to_string(); + let rtype = Rtype::A; + let rclass = Rclass::IN; + let ttl = 7200; + + let rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + assert_eq!(rrset.get_ttl(), 7200); + } + + #[test] + fn test_get_labels() { + let name = "sub.example.com".to_string(); + let rtype = Rtype::A; + let rclass = Rclass::IN; + let ttl = 3600; + + let rrset = RRset::new(name.clone(), rtype, rclass, ttl); + + assert_eq!(rrset.get_labels(), 3); + } +} diff --git a/src/tsig.rs b/src/tsig.rs new file mode 100644 index 00000000..4954d582 --- /dev/null +++ b/src/tsig.rs @@ -0,0 +1,656 @@ +use std::fmt::Debug; +//aquí debe ir todo lo relacionado a la implementación de tsig como módulo +use crypto::mac::MacResult; +use crate::domain_name::DomainName; +use std::time::SystemTime; +use crate::message::rclass::Rclass; +use crate::message::resource_record::{ResourceRecord, ToBytes}; + +use crate::message::{rdata::tsig_rdata::TSigRdata, DnsMessage,}; +use crate::message::rdata::Rdata; +use crypto::hmac::Hmac as crypto_hmac; +use crypto::mac::Mac as crypto_mac; +use crypto::{sha1::Sha1,sha2::Sha256}; +use crate::message::rdata::a_rdata::ARdata; +use crate::message::rrtype::Rrtype; + + + + +#[derive(Debug)] +//TODO: usar arreglar el funcionamiento del enum en sign_msg +pub enum TsigAlgorithm { + HmacSha1, + HmacSha256, +} + +fn tsig_alg_to_string(alg: &TsigAlgorithm) -> String { + match alg { + TsigAlgorithm::HmacSha1 => "hmac-sha1".to_string(), + TsigAlgorithm::HmacSha256 => "hmac-sha256".to_string(), + } +} +pub fn string_to_tsig_alg(name: String) -> TsigAlgorithm{ + let sha1 = "hmac-sha1".to_string(); + let sha256 = "hmac-sha256".to_string(); + match name{ + sha1=> TsigAlgorithm::HmacSha1, + sha256 => TsigAlgorithm::HmacSha256 + } +} + +#[derive(PartialEq)] +#[derive(Debug)] +pub enum TsigErrorCode{ + NOERR = 0, + BADSIG = 16, + BADKEY = 17, + BADTIME = 18, + FORMERR = 1, + +} +//TODO: Encontrar alguna manera de pasar una referencia Digest u Hmac de un algoritmo no especificado +// función auxiliar para evitar la redundancia de código en sign_tsig +fn set_tsig_rd(name: String, original_id: u16, result: MacResult, + fudge: u16, time_signed: u64, mac_size: u16) -> TSigRdata{ + let mut tsig_rd: TSigRdata = TSigRdata::new(); + let mac = result.code(); + + //Convertir los bytes brutos a una cadena hexadecimal + let a_name = name.to_lowercase(); + let a_name = DomainName::new_from_string(a_name); + //añadir los valores correspondientes al tsig_rd + tsig_rd.set_algorithm_name(a_name); + tsig_rd.set_mac_size(mac_size); + tsig_rd.set_mac(mac.to_vec()); + tsig_rd.set_fudge(fudge); + tsig_rd.set_original_id(original_id); + tsig_rd.set_time_signed(time_signed); + + return tsig_rd; +} +//TODO: crear una función para simplificar la extracción de bits paa simplificar código +// This function extracts the digest +#[doc = r"This function recives a DNS message and generate the digest da. Requested by RFC 8945 4.3.3 "] +pub fn get_digest_request(mac: Vec ,dns_msg: Vec, tsig_rr: ResourceRecord) -> Vec { + let mut res: Vec = vec![]; + + if (mac.len() != 0) { + let mac_len = mac.len() as u16; + let bytes_mac_len = mac_len.to_be_bytes(); + res.push(bytes_mac_len[0]); + res.push(bytes_mac_len[1]); + res.extend(mac.clone()); + } + res.extend(dns_msg.clone()); + let tsig_rdata = tsig_rr.get_rdata(); + res.extend(tsig_rr.get_name().to_bytes()); + //The below shifts are meant to correctly retreive theby + //processing TSIG RR + let rclass_bytes: u16 = Rclass::from(tsig_rr.get_rclass()).into(); + let rclass_ubyte = (rclass_bytes >> 8) as u8; + let rclass_lbyte = rclass_bytes as u8; + res.push(rclass_ubyte); + res.push(rclass_lbyte); + + let rclass_ttl: u32 = tsig_rr.get_ttl(); + let r_ttl1 = (rclass_ttl >> 24) as u8; + let r_ttl2 = (rclass_ttl >> 16) as u8; + let r_ttl3 = (rclass_ttl >> 8) as u8; + let r_ttl4 = rclass_ttl as u8; + res.push(r_ttl1); + res.push(r_ttl2); + res.push(r_ttl3); + res.push(r_ttl4); + + //processing TSIG RDATA + let tsig_rd = match tsig_rdata { + Rdata::TSIG(tsig_rd) => tsig_rd, + _ => panic!() + }; + let a_name = tsig_rd.get_algorithm_name().to_bytes(); + // Remember that time_signed is u48 + let tsig_rd_time_signed: u64 = tsig_rd.get_time_signed(); + let tsig_rd_fudge: u16 = tsig_rd.get_fudge(); + let tsig_rd_error: u16= tsig_rd.get_error(); + let tsig_rd_other_len: u16 = tsig_rd.get_other_len(); + let tsig_rd_other_data = tsig_rd.get_other_data(); + + res.extend(a_name); + + let time_s1 = (tsig_rd_time_signed >> 40) as u8; + let time_s2 = (tsig_rd_time_signed >> 32) as u8; + let time_s3 = (tsig_rd_time_signed >> 24) as u8; + let time_s4 = (tsig_rd_time_signed >> 16) as u8; + let time_s5 = (tsig_rd_time_signed >> 8) as u8; + let time_s6 = (tsig_rd_time_signed) as u8; + res.push(time_s1); + res.push(time_s2); + res.push(time_s3); + res.push(time_s4); + res.push(time_s5); + res.push(time_s6); + + let fudge1 = (tsig_rd_fudge >> 8) as u8; + let fudge2 = (tsig_rd_fudge) as u8; + res.push(fudge1); + res.push(fudge2); + + let error1 = (tsig_rd_error >> 8) as u8; + let error2 = (tsig_rd_error) as u8; + res.push(error1); + res.push(error2); + + let otherl1 = (tsig_rd_other_len >> 8) as u8; + let otherl2 = (tsig_rd_other_len) as u8; + res.push(otherl1); + res.push(otherl2); + + res.extend(tsig_rd_other_data); + + return res; +} + +fn digest(bytes: Vec, tsig_algorithm: TsigAlgorithm, key: Vec) -> Vec{ + match tsig_algorithm { + TsigAlgorithm::HmacSha1 => { + + //new_query_message.push(); + let mut hasher = crypto_hmac::new(Sha1::new(), &key); + hasher.input(&bytes[..]); + hasher.result().code().to_vec() + }, + TsigAlgorithm::HmacSha256 => { + let mut hasher = crypto_hmac::new(Sha256::new(), &key); + hasher.input(&bytes[..]); + hasher.result().code().to_vec() + } + } +} + +//RFC 8945, section 5.1 +#[doc = r"This function creates the signature of a DnsMessage with a key in bytes and the algName that will be used to encrypt the key."] +pub fn sign_tsig(query_msg: &mut DnsMessage, key: &[u8], alg_name: TsigAlgorithm, + fudge: u16, time_signed: u64, key_name: String, mac_request: Vec) -> Vec { + let mut tsig_rd: TSigRdata = TSigRdata::new(); + let new_query_message = query_msg.clone(); + let original_id = query_msg.get_query_id(); + let alg_name_str = tsig_alg_to_string(&alg_name); + let tsig_rr= set_tsig_vars(alg_name_str.as_str(), key_name.as_str(), + time_signed, fudge); + let digest_comp = get_digest_request(mac_request, new_query_message.to_bytes(), + tsig_rr); + match alg_name { + + TsigAlgorithm::HmacSha1 => { + + //new_query_message.push(); + let mut hasher = crypto_hmac::new(Sha1::new(), key); + hasher.input(&digest_comp[..]); + let result = hasher.result(); + tsig_rd = set_tsig_rd( + "hmac-sha1".to_lowercase(), + original_id, + result, + fudge, + time_signed, + 20); + + }, + TsigAlgorithm::HmacSha256 => { + let mut hasher = crypto_hmac::new(Sha256::new(), key); + hasher.input(&digest_comp[..]); + let result = hasher.result(); + tsig_rd = set_tsig_rd( + "hmac-sha256".to_lowercase(), + original_id, + result, + fudge, + time_signed, + 32); + + }, + _ => {panic!("Error: Invalid algorithm")}, + } + let rr_len = tsig_rd.to_bytes().len() as u16; + let signature = tsig_rd.get_mac(); + let mut new_rr: ResourceRecord = ResourceRecord::new(Rdata::TSIG(tsig_rd)); + new_rr.set_name(DomainName::new_from_string(key_name)); + new_rr.set_rdlength(rr_len); + let mut vec: Vec = vec![]; + vec.push(new_rr); + query_msg.add_additionals(vec); + return signature; +} + +//Revisa si el nombre de la llave es correcto +fn check_key(key_in_rr:String, key_name:String)-> bool { + key_in_rr.eq(&key_name) +} + +//Verifica que el algoritmo esté disponible, y además esté implementado +fn check_alg_name(alg_name:&String, alg_list: Vec<(String,bool)>) -> bool{ + let mut answer: bool = false; + for (name,available) in alg_list { + if name.eq(alg_name){ + if available { + answer = true; + } + } + } + return answer +} + +//Verifica que los mac sean iguales +fn check_mac(new_mac: Vec, mac: Vec) -> bool{ + if mac.len()!=new_mac.len(){ + return false + } + for i in 0..mac.len(){ + if new_mac[i]!=mac[i]{ + return false + } + } + true +} + +//Verifica el error de la sección 5.2.3 +fn check_time_values(mytime: u64,fudge: u16, time: u64) -> bool { + let part1 = (time - (fudge as u64)) < mytime; + let part2 = mytime < (time+(fudge as u64)); + part1 && part2 +} + +//RFC 8945 5.2 y 5.4 +//verificar que existen los resource records que corresponden a tsig +//vector con resource records que son TSIG. Luego se Verifica si hay algún tsig rr +fn check_exists_tsig_rr(add_rec: &Vec) -> bool { + let filtered_tsig:Vec<_> = add_rec.iter() + .filter(|tsig| + if let Rdata::TSIG(_) = tsig.get_rdata() {true} + else {false}).collect(); + + filtered_tsig.len()==0 +} + + +//Debe haber un único tsig +//Tsig RR debe ser el último en la sección adicional, y debe ser único2 +fn check_last_one_is_tsig(add_rec: &Vec) -> bool { + let filtered_tsig:Vec<_> = add_rec.iter() + .filter(|tsig| + if let Rdata::TSIG(_) = tsig.get_rdata() {true} + else {false}).collect(); + + let islast = if let Rdata::TSIG(_) = add_rec[add_rec.len()-1].get_rdata() {false} else {true}; + + filtered_tsig.len()>1 || islast +} + +#[doc = r"This function process a tsig message, checking for errors in the DNS message"] +pub fn process_tsig(msg: &DnsMessage, key:&[u8], key_name: String, time: u64, + available_algorithm: Vec<(String, bool)>, mac_to_process: Vec) -> (bool, TsigErrorCode) { + let mut retmsg = msg.clone(); + let mut addit = retmsg.get_additional(); + //RFC 8945 5.2 y 5.4 + //verificar que existen los resource records que corresponden a tsig + //vector con resource records que son TSIG. Luego se Verifica si hay algún tsig rr + if check_exists_tsig_rr(&addit) { + println!("RCODE 1: FORMERR"); + return (false, TsigErrorCode::FORMERR); + } + + //Debe haber un único tsig + //Tsig RR debe ser el último en la sección adicional, y debe ser único + if check_last_one_is_tsig(&addit) { + println!("RCODE 1: FORMERR"); + return (false, TsigErrorCode::FORMERR); + } + + //sacar el último elemento del vector resource record, y disminuir elvalor de ARCOUNT + let rr_copy = addit.pop().expect("No tsig rr"); + let mut tsig_rr_copy = TSigRdata::new(); + match rr_copy.get_rdata() { + Rdata::TSIG(data) =>{ + tsig_rr_copy = data; + } + _ => { + println!("error"); + unimplemented!("TODO: error code if last rr is not tsig; FORMERR") + } + } + + //RFC 8945 5.2.1 + let key_in_rr = rr_copy.get_name().get_name(); + let name_alg = tsig_rr_copy.get_algorithm_name().get_name(); + + let flag = check_alg_name(&name_alg, available_algorithm); + if !flag { + println!("RCODE 9: NOAUTH\n TSIG ERROR 17: BADKEY"); + return (false, TsigErrorCode::BADKEY); + } + + let cond1 = check_key(key_in_rr.clone(), key_name.clone()); + if !cond1 { + println!("RCODE 9: NOAUTH\n TSIG ERROR 17: BADKEY"); + println!("key in rr: {:?} key given {:?}", key_in_rr, key_name); + return (false, TsigErrorCode::BADKEY); + } + + //RFC 8945 5.2.2 + //retmsg.set_additional(addit); + let fudge = tsig_rr_copy.get_fudge(); + let time_signed = tsig_rr_copy.get_time_signed(); + let mac_received = tsig_rr_copy.get_mac(); + let key_name = rr_copy.get_name().get_name(); + let mut new_alg_name: TsigAlgorithm = TsigAlgorithm::HmacSha1; + match name_alg.as_str() { + "hmac-sha1" => new_alg_name = TsigAlgorithm::HmacSha1, + "hmac-sha256" => new_alg_name = TsigAlgorithm::HmacSha256, + &_ => println!("not supported algorithm") + } + + //let nuevo_len_arcount = addit.len() as u16; + //let mut new_header = retmsg.get_header(); + //new_header.set_arcount(nuevo_len_arcount); + //retmsg.set_header(new_header); + retmsg.set_additional(addit); + retmsg.update_header_counters(); + + // This gets the bytes to use the function and generate the digest + let bytes_to_hash = get_digest_request(mac_to_process, retmsg.to_bytes(), rr_copy); + + let new_mac = digest(bytes_to_hash, new_alg_name, key.to_vec()); + + let cond2 = check_mac(new_mac, mac_received); + + if !cond2 { + println!("RCODE 9: NOAUTH\n TSIG ERROR 16: BADSIG"); + return (false, TsigErrorCode::BADSIG) + } + //let mytime = SystemTime::now().duration_since(UNIX_EPOCH).expect("no debería fallar el tiempo"); + let cond3 = check_time_values(time, fudge, time_signed); + if !cond3 { + println!("RCODE 9: NOAUTH\n TSIG ERROR 18: BADTIME"); + return (false, TsigErrorCode::BADTIME) + } + (true, TsigErrorCode::NOERR) + +} + +pub fn immediate_process_tsig(msg: &DnsMessage, key:&[u8], key_name: String, + available_algorithm: Vec<(String, bool)>, mac_to_process: Vec) -> (bool, TsigErrorCode) { + + let time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs(); + process_tsig(msg, key, key_name, time, available_algorithm, mac_to_process) +} + +//Auxiliar function to create the TSIG variables and resource recrods +#[doc= r"This function helps to set create a partial TSIG resource record on a DNS query"] +fn set_tsig_vars(alg_name: &str, name: &str, time_signed: u64, fudge: u16) -> ResourceRecord{ + //TSIG Variables + // TSIG RDATA + let mut tsig_rd: TSigRdata = TSigRdata::new(); + tsig_rd.set_algorithm_name(DomainName::new_from_str(alg_name)); + tsig_rd.set_time_signed(time_signed); + tsig_rd.set_fudge(fudge); + tsig_rd.set_error(0); + tsig_rd.set_other_len(0); + // TSIG RR + let mut tsig_rr = ResourceRecord::new(Rdata::TSIG(tsig_rd)); + tsig_rr.set_name(DomainName::new_from_str(name)); + //tsig_rr.set_rclass(Rclass::ANY); + tsig_rr.set_ttl(0); + + return tsig_rr +} + +//Sección de tests unitarios + +#[test] +fn check_process_tsig_exists() { + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + //Client process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + let server_key = b"1234567890"; + lista.push((String::from("hmac-sha256"),true)); + let (answer, error) = process_tsig(& response, server_key, key_name, 21010, lista, vec![]); + assert!(!answer); + assert_eq!(error,TsigErrorCode::FORMERR); +} + +#[test] +fn check_process_tsig_exists2() { + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let alg_name2 = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = "".to_string(); + let name = "test.com"; + // cloning response + let mut response2 = response.clone(); + + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name.clone(), vec![]); + let mut response_capture = response.clone(); + sign_tsig(&mut response_capture, server_key, alg_name2, fudge, time_signed, key_name.clone(), vec![]); + //Client process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + lista.push((String::from("hmac-sha256"),true)); + let (control_answer, _) = process_tsig(& response, server_key, key_name.clone(),21010, lista.clone(), vec![]); + assert!(control_answer); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, 21010, lista, vec![]); + assert!(!answer); + assert_eq!(error, TsigErrorCode::FORMERR); +} + +// verificar que no se haya añadido otro resource record en el additionals luego de añadir un tsig_rr +#[test] +fn check_process_tsig_exists3(){ + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = ""; + //se crea un rr TSIG que se añadirá en adittionals + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name.to_string(), vec![]); + + //se agrega otro resource record en el additional... + let mut new_additional = Vec::::new(); + let a_rdata5 = Rdata::A(ARdata::new()); + let rr5 = ResourceRecord::new(a_rdata5); + new_additional.push(rr5); + response.add_additionals(new_additional); + let mut response_capture = response.clone(); + + //Client process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + lista.push((String::from("hmac-sha256"),true)); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, 21010, lista, vec![]); + assert!(!answer); + assert_eq!(error, TsigErrorCode::FORMERR); +} +#[test] +fn check_process_tsig_alg_name() { + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = "".to_string(); + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name, vec![]); + let mut response_capture = response.clone(); + //Client process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + //suponemos que hmacsha256 no está disponible + lista.push((String::from("hmac-sha1"),true)); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, 21010, lista, vec![]); + assert!(!answer); + assert_eq!(error,TsigErrorCode::BADKEY); +} +#[test] +fn check_process_tsig_alg_name2() { + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = "".to_string(); + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name, vec![]); + let mut response_capture = response.clone(); + //Client process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + //suponemos que reconocemos hmac-sha256, pero no está implementado + lista.push((String::from("hmac-sha256"),false)); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, 21010, lista, vec![]); + assert!(!answer); + assert_eq!(error,TsigErrorCode::BADKEY); +} +#[test] +fn check_process_tsig_key(){ + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = "".to_string(); + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name, vec![]); + let mut response_capture = response.clone(); + //Client process + let key_name:String = "different".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + //suponemos que reconocemos hmac-sha256, pero no está implementado + lista.push((String::from("hmac-sha256"),false)); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, 21010, lista, vec![]); + assert!(!answer); + assert_eq!(error,TsigErrorCode::BADKEY); +} +//TODO: completar este test, hay cosas que faltan por implementar +#[test] +fn check_process_tsig_badsign(){ + // Se establece un DnsMessage de prueba. Lo firmaremos, alteraremos la firma generada y esperamos recibir un error BADSIGN + let mut msg1 = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha1; + let fudge = 1000; + let time_signed = 210000000; + let key_name = "".to_string(); + // se firma el mensaje con algoritmo SHA-1 + sign_tsig(& mut msg1, key, alg_name, fudge, time_signed, key_name, vec![]); + let mut lista :Vec<(String, bool)> = vec![]; + lista.push((String::from("hmac-sha1"),true)); + lista.push((String::from("hmac-sha256"),true)); + // se verifica que el mensaje está firmado, pero se usa otra key + let key_name = "".to_string(); + let key2 = b"12345678909"; + let (answer,error) = process_tsig(&mut msg1, key2, key_name, time_signed,lista, vec![]); + assert_eq!(error,TsigErrorCode::BADSIG); +} +#[test] +fn check_proces_tsig_badtime(){ + //Server process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = "".to_string(); + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name, vec![]); + let mut response_capture = response.clone(); + //Client process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + //suponemos que reconocemos hmac-sha256, pero no está implementado + lista.push((String::from("hmac-sha256"),true)); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, + 22010, lista, vec![]); + assert!(!answer); + assert_eq!(error,TsigErrorCode::BADTIME); +} +#[test] +fn check_process_tsig() { + //sender process + let mut response = DnsMessage::new_response_message(String::from("test.com"), "NS", "IN", 1, true, 1); + let server_key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha256; + let fudge = 300; + let time_signed = 21000; + let key_name = "".to_string(); + sign_tsig(&mut response, server_key, alg_name, fudge, time_signed, key_name, vec![]); + let mut response_capture = response.clone(); + //recv process + let key_name:String = "".to_string(); + let mut lista :Vec<(String, bool)> = vec![]; + lista.push((String::from("hmac-sha256"),true)); + let (answer, error) = process_tsig(& response_capture, server_key, key_name, + 21010, lista, vec![]); + assert!(answer); + assert_eq!(error,TsigErrorCode::NOERR); +} +//Unitary test to verify that the signer function is working properly +#[test] +fn check_signed_tsig() { + let key = b"1234567890"; + let alg_name = TsigAlgorithm::HmacSha1; + let fudge = 0; + let time_signed = 0; + let id = 6502; + let name: String = "".to_string(); + let mac_size = 20; + let domain = DomainName::new_from_str("uchile.cl"); + //DNS message + let mut q = DnsMessage::new_query_message( + domain.clone(), + Rrtype::A, + Rclass::ANY, + 0, + false, + id + ); + //partial TSIG Resource record verify the signing process + let tsig_rr = set_tsig_vars(tsig_alg_to_string(&alg_name).as_str(), &name, time_signed, fudge); + let q_for_mac = q.clone(); + //creation of the signature to compare + let firma_a_comparar = sign_tsig(&mut q, key, alg_name, fudge, time_signed, name, vec![]); + // creation of the signature digest + let dig_for_mac = get_digest_request(vec![],q_for_mac.to_bytes(), tsig_rr); + let mut hasher = crypto_hmac::new(Sha1::new(), key); + hasher.input(&dig_for_mac[..]); + + let result = hasher.result(); + let mac_to_cmp = result.code(); + + let rr = q.get_additional().pop().expect("Should be a tsig"); + match rr.get_rdata() { + Rdata::TSIG(data) => { + assert_eq!(data.get_algorithm_name(), DomainName::new_from_str("hmac-sha1")); + assert_eq!(data.get_time_signed(), time_signed); + assert_eq!(data.get_fudge() , fudge); + assert_eq!(data.get_mac_size(), 20); + assert_eq!(data.get_original_id(), id); + assert_eq!(data.get_error(), 0); + assert_eq!(data.get_other_len(), 0); + assert!(data.get_other_data().is_empty()); + }, + _ =>{ + assert!(false); + } + } + println!("Comparando el mac"); + for i in 0..mac_to_cmp.len() { + assert_eq!(mac_to_cmp[i], firma_a_comparar[i]); + } +} diff --git a/tests/integration_test.rs b/tests/integration_test.rs index 1541b83c..3c6f72c3 100644 --- a/tests/integration_test.rs +++ b/tests/integration_test.rs @@ -1,8 +1,10 @@ + use std::{net::IpAddr, str::FromStr}; use dns_rust::{async_resolver::{config::ResolverConfig, AsyncResolver}, client::client_error::ClientError, domain_name::DomainName, message::{rclass::Rclass, rdata::Rdata, resource_record::{ResourceRecord, ToBytes}, rrtype::Rrtype, DnsMessage}}; + // TODO: Change params type to intoDomainName async fn query_response(domain_name: &str, protocol: &str, qtype: &str) -> Result, ClientError> { @@ -13,6 +15,7 @@ async fn query_response(domain_name: &str, protocol: &str, qtype: &str) -> Resul domain_name, protocol, qtype, + "IN").await; response.map(|lookup_response| lookup_response.to_vec_of_rr()) @@ -109,5 +112,3 @@ async fn no_resource_available() { assert!(response.is_err()); } - - diff --git a/tests/tsig_integration_tests.rs b/tests/tsig_integration_tests.rs new file mode 100644 index 00000000..a73078f0 --- /dev/null +++ b/tests/tsig_integration_tests.rs @@ -0,0 +1,178 @@ +use std::{collections::HashMap, net:: UdpSocket, thread, time::Duration}; +use dns_rust::{domain_name::DomainName, message::{rdata::{tsig_rdata::TSigRdata, Rdata}, rrtype::Rrtype, DnsMessage},tsig::{process_tsig, sign_tsig, string_to_tsig_alg, TsigAlgorithm, TsigErrorCode}}; +use dns_rust::message::rclass::Rclass; + + +///RFC 8945 TSIG tests +/*This tests verifies section 5.3: + When a server has generated a response to a signed request, it signs + the response using the same algorithm and key. The server MUST NOT + generate a signed response to a request if either the key is invalid + (e.g., key name or algorithm name are unknown) or the MAC fails + validation; see Section 5.3.2 for details of responding in these + cases. + + It also MUST NOT generate a signed response to an unsigned request, + except in the case of a response to a client's unsigned TKEY request + if the secret key is established on the server side after the server + processed the client's request. Signing responses to unsigned TKEY + requests MUST be explicitly specified in the description of an + individual secret key establishment algorithm [RFC3645]. + + The digest components used to generate a TSIG on a response are: + + Request MAC + DNS Message (response) + TSIG Variables (response) + + DISCLAIMER: Como no hay un "NameServer" implementado, se probó la firma y verififcaciónde TSIG utilizando + threads y scokets. La idea central es tener un thread recibiendo datos de localhost, el cual tiene en alguna + parte guardados pares (key, name) que serían utilizados para la autenticación (en este caso, se guardaron los + pares en un hash_map. Como se guarden no es relevante para tsig, depende de la implementación del servidor. + Lo único importante es que podamos buscar la llave asociada a un cierto nombre, de acuerdo a la solicitud que + recibamos). + En este test se verifica a nivel macro el correcto flujo de TSIG: primero se envia a un host en localhost + una query firmada, el cual verifica la integridad de la query y responde con un respuesta firmada que será verificada. +*/ +#[tokio::test] +async fn tsig_signature() { + // the key to test tsig flow. The server should had the same key + let key = b"1234567890"; + // global test variables + let alg_name = TsigAlgorithm::HmacSha1; + let fudge = 100; + let time_signed = 12345678; + let id = 6502; + let name = "nictest.cl"; + let mut dns_query_message = + DnsMessage::new_query_message( + DomainName::new_from_string(name.to_string()), + Rrtype::A, + Rclass::IN, + 0, + false, + id); + //lista de algoritmos disponibles. En este caso, ambos host tendrán la misma + let mut a_algs :Vec<(String, bool)> = vec![]; + a_algs.push((String::from("hmac-sha1"),true)); + a_algs.push((String::from("hmac-sha256"),true)); + + + //Código para el servidor. Recibe un mensaje firmado, lo verifica y envía una repuesta autenticada, según lo descrito en el + //RFC 8945. Este servidor tiene su propia lista de algoritmos disponibles y llaves asociadas a nombres de dominio + fn host(){ + println!("I am a host"); + //la lista de algoritmos del host + let mut list :Vec<(String, bool)> = vec![]; + list.push((String::from("hmac-sha1"),true)); + list.push((String::from("hmac-sha256"),true)); + + // se crean las llaves del servidor + let key1 = b"1234567890"; + let key2 = b"1034567692"; + // se mapean las llaves anteriores a un nombre. Acá deberemos buscar el nombre de lo que se reciba para utilizar la llave correcta + let mut keys = HashMap::new(); + keys.insert(DomainName::new_from_string("nictest.cl".to_string()), key1); + keys.insert(DomainName::new_from_string("example.cl".to_string()), key2); + + //se recibiran datos de otro thread a través de un socket UDP + let udp_socket = UdpSocket::bind("127.0.0.1:8002").expect("Failed to bind to address"); + let mut buf = [0; 512]; + + match udp_socket.recv_from(&mut buf) { + + Ok((size, source)) => { + println!("Received {} bytes from {}", size, source); + let mut data = DnsMessage::from_bytes(&buf[0..size]).unwrap(); + println!("The data is {:?}", data); + let mut addit = data.get_additional(); + let rr = addit.pop().expect("No tsigrr"); + let mut tsig_rd = TSigRdata::new(); + // let mut can_sign = false; + + match rr.get_rdata() { + Rdata::TSIG(data) =>{ + tsig_rd = data; + } + _ => { + //can_sign = true; + println!("error: no TSIG rdata found!"); + } + } + //se extraen las variables TSIG necesarias. + let alg_name = tsig_rd.get_algorithm_name().get_name(); + let time =tsig_rd.get_time_signed(); + let fudge = tsig_rd.get_fudge(); + let mac = tsig_rd.get_mac(); + let name = rr.get_name(); + let key_name = name.clone().get_name(); + // se extrae la llave necesaria + let key_found = keys[&name]; + + //el servidor verifica la estructura del tsig recibido. Sumamos un pequeño delay al time para simular retraso + let (answer,error) = process_tsig(&data, key_found, key_name.clone(), time + 50, list, vec![]); + //se setea el aditional sin el ultimo resource record, para que sign_tsig lo regenere + data.set_additional(addit); + data.update_header_counters(); + // se firma el mensaje recibido con el digest de la respuesta. Notar que el vector final ahora no está vacío + sign_tsig(&mut data, key_found,string_to_tsig_alg(alg_name),fudge,time, key_name, mac); + let response = &DnsMessage::to_bytes(&data); + //se verifica que la request haya pasado proces_tsig + assert_eq!(error,TsigErrorCode::NOERR); + + // se envia la respuesta si lo anterior resultó ser correcto + udp_socket + .send_to(&response, source) + .expect("Failed to send response"); + + } + Err(e) => { + eprintln!("Error receiving data: {}", e); + + } + } + + } + + //Lanzamiento de threads + println!("Starting server"); + let server_handle = thread::spawn(|| { + host(); + + }); + thread::sleep(Duration::from_secs(2)); + + // se instancia un socket cliente que enviará y mensajes + let client_sock = UdpSocket::bind("127.0.0.1:8001").expect("Nothing"); + // El cliente firma el mensaje para enviar al servidor. Se guarda el mac de la firma + let mac = sign_tsig(&mut dns_query_message, key, alg_name, fudge, time_signed, name.to_string(), vec![]); + let buf = dns_query_message.to_bytes(); + client_sock.send_to(&buf,"127.0.0.1:8002").unwrap(); + println!("Mensaje enviado"); + server_handle.join().unwrap(); + let mut buf = [0; 512]; + + // Ahora el cliente verifica la respuesta recibida del servidor + match client_sock.recv_from(&mut buf) { + + Ok((size, source)) => { + println!("Received {} bytes from {}", size, source); + let data = DnsMessage::from_bytes(&buf[0..size]).unwrap(); + println!("The data is {:?}", data); + + + // El cliente procesa la respuesta + let (answer, error ) = process_tsig(&data, key, name.to_string(), time_signed, a_algs, mac); + // se verifica que el mensaje haya pasado process_tsig + assert!(answer); + assert_eq!(error,TsigErrorCode::NOERR); + } + Err(e) => { + eprintln!("Error receiving data: {}", e); + + } + } + + +} + \ No newline at end of file